well one can see the work you have dedicated to this.. But i see a small mistake.. the Perceptive of the girls legs ( Ankles) to the height of the rim of the barrel dosn't match pretty well... And the 2nd barrel behind looks as if its kept as an image on the background then as a single picture...

Anyways GL Author

You could have found some barrels as sources anywhere. The rest is just the usual DA pics. Good luck on your collage.

good idea, the style of the image is not my taste, but thats personal i dont think the images go nice together but others might like this style